Hi all,
I have an EIGRP question. It would be greatly appreciated if someone can
shed some light on this.
I found the following Routing Table from TCP / IP Vol1 by Jeff Doyle. But I
don't understand why a summary route would be pointing to Null0?
Jeff explains it as "this route helps to prevent potential black holes when
default and summary routes are used"... which confuses me even more :(
Show ip route
D 192.168.16.0/24 [90/3219456] via 172.20.15.5, 00:41:41, Serial 0
C 192.168.17.0/24 is directly connected, Ethernet 0
C 192.168.18.0/24 is variably subnetted, 2 subnets, 2 masks
D EX 172.25.0.0/16 [170/2221056] via 172.20.15.5, 00:41:48, Serial 0
172.20.0.0/16 is variably subnetted, 2 subnets, 2 masks
D 172.20.10.0/24 [90/2195456] via 172.20.15.5, 00:41:48, Serial 0
C 172.20.15.4/30 is directly connected, Serial 0
D 172.20.15.0/30 [90/2681856] via 172.20.15.5, 00:41:48, Serial 0
D 172.20.0.0/16 is a summary, 00:00:09, Null0
Please help...
Best Regards,
Hunt Lee
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